/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.http.fileupload.util;

import org.apache.tomcat.util.http.fileupload.FileItemHeaders;

import java.io.Serializable;
import java.util.*;

/**
 * Default implementation of the {@link FileItemHeaders} interface.
 *
 * @since 1.2.1
 */
public class FileItemHeadersImpl implements FileItemHeaders, Serializable {

	/**
	 * Serial version UID, being used, if serialized.
	 */
	private static final long serialVersionUID = -4455695752627032559L;

	/**
	 * Map of <code>String</code> keys to a <code>List</code> of
	 * <code>String</code> instances.
	 */
	private final Map<String, List<String>> headerNameToValueListMap =
			new LinkedHashMap<String, List<String>>();

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String getHeader(String name) {
		String nameLower = name.toLowerCase(Locale.ENGLISH);
		List<String> headerValueList = headerNameToValueListMap.get(nameLower);
		if (null == headerValueList) {
			return null;
		}
		return headerValueList.get(0);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Iterator<String> getHeaderNames() {
		return headerNameToValueListMap.keySet().iterator();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Iterator<String> getHeaders(String name) {
		String nameLower = name.toLowerCase(Locale.ENGLISH);
		List<String> headerValueList = headerNameToValueListMap.get(nameLower);
		if (null == headerValueList) {
			headerValueList = Collections.emptyList();
		}
		return headerValueList.iterator();
	}

	/**
	 * Method to add header values to this instance.
	 *
	 * @param name  name of this header
	 * @param value value of this header
	 */
	public synchronized void addHeader(String name, String value) {
		String nameLower = name.toLowerCase(Locale.ENGLISH);
		List<String> headerValueList = headerNameToValueListMap.get(nameLower);
		if (null == headerValueList) {
			headerValueList = new ArrayList<String>();
			headerNameToValueListMap.put(nameLower, headerValueList);
		}
		headerValueList.add(value);
	}

}
